Army crawling

On monday my daughter started army crawling. My son was crawling by 5 months and I can tell his sister wants to keep up. She is currently 5 months.
Life is no longer safe. I can't leave her on the bed, she always has to be placed on the floor, or strapped to a chair.
Hopefully I have a little while to figure out how to keep her away from the staircase, while still allowing a three year old to use it. Right now she has never moved from one room to another, thankfully! My son could do that by four months, yes before he could crawl.
I dream about having that baby who just sits contently on a blanket for the whole hour of relief society at 10 months.